Here’s an interesting image that shows the Lovepedal product line and their deviations and similarities. Johann Burkard. It’s a couple of years old now and pretty out of date. But you can add items to it with the Freemind Mind Mapping software. Check out the original post and make additions to it here:
http://johannburkard.de/blog/music/effects/lovepedal-pedal-list.html